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1.- Ammonites from the upper part of the Pierre Shale and Fox Hills Formation of Colorado
Landman, Neil H.; Cobban, William A.
New York: American Museum of Natural History, 2003
American Museum Novitates
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2.- Scaphitid ammonites of the Upper Cretaceous (Maastrichtian) Fox Hills formation in South Dakota and Wyoming
Landman, Neil H.; Waage, Karl M.
New York: American Museum of Natural History, 1993
Bulletin of the American Museum of Natural History
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3.- The Maastrichtian Ammonites Coahuilites sheltoni Bose, 1928, and Sphenodiscus pleurisepta (Conrad, 1857), from the Uppermost Pierre Shale and Basal Fox Hills Formation of Colorado and Wyoming
Kennedy, William James; Landman, Neil H.; Cobban, William A.
New York: American Museum of Natural History, 1996
American Museum Novitates
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